Hi Abdullah, and welcome.
Here's the thing: wine making can be as simple or as complicated as you want. If you make wine from any fruit - from apricots to pomegranates, from apples to mangoes, (you can make delicious wine, too from vegetables: zucchini or peas or carrots, or from flowers - hibiscus or elderflowers, are two examples, and then there is honey. Honey makes a delicious wine which can be dry or sweet), you can balance the acidity with sweetness. In other words, if the wine is too tart (acidic) you can stabilize the wine to prevent further fermentation and then add sugar to counter the acidity. If the wine is not acidic enough you can add acid by adding, lemon juice, for example, or tartaric acid or a blend of acids... but unless you are making wine to a very specific recipe and you are making this exact wine to be sold again and again and again then the best way to tell if a wine is too acidic or not acidic enough is by tasting it. Your tongue and taste buds are a far better tool than the most expensive pH meter you can buy. From your post, Abdullah, it is not clear to me whether you are planning on making wine for yourself or you are planning on learning to make wine to sell commercially.
Let me assume that you are making wine for your own pleasure and enjoyment, then I would say you want to make wine in the least complicated way that allows you to make a delicious drink. In my opinion, there is really no need to worry about pH when you are making wine and the only time to PERHAPS think about pH is when you are aging the wine (storing it) and you need to know how much potassium metabisulfite (K-meta) you need to add to reduce the risk of oxidation. But for that purpose you are not trying to reduce or increase the acidity. You simply want to measure it. But unless you are making hundreds or thousands of liters of wine then you can simply add standard doses of K-meta and you can sleep without worries.
Last point: are you planning on making wine from grapes sold for eating? Those grapes are unlikely to make very good wine: the amount of sugar they contain is not great and their flavor is not wonderful either. They also may not have much tannin. Wine grapes are not table grapes. If, however, you are planning on making wine from table grapes then the acidity of the grapes is not really going to be as great a concern as producing a wine with the richness of flavor that you might be expecting.
Good luck! Wine making is a wonderful hobby.